Silicone insulating paper material



Aug. 2, 1949. H. s. COOK, JR

SILICONE INSULATING PAPER MATERIAL Filed Nov. 15, 1945 C I I m u n n m n "l u I "1555!! 55!! 511555 VIII'IIIIIII'IIIIIIA "III.

HAROLD S. Coax, Jn.

Mfl/Z W Patented Aug. 2,1949

UNITED STATES PATENT OFFICE SILICONE INSULATING PAPER MATERIAL Harold S. Cook, Jr., Pasadena, Calif. Application November 15, 1945, Serial No. 628,797

1 Claim. 1

This invention relates to new and useful improvements in insulating materials. While not limited thereto, it is particularly concerned with containers using these insulating materials and providing excellent insulation, both thermal and electrical.

More particularly the invention proposes the construction of safety containers which are particularly adapted to be used in carrying and bandling materials which are perishable under changing conditions of climate and temperature. The new devices are arranged to be extremely light in weight, cheap in cost, therefore easily replaceable and also to permit their use in many applications. I

Among the advantages of the products of this invention are resistance against and stability to heat, neutral reaction to most chemicals, chemical inertness, a low dielectric constant and low power factor over a wide frequency range, insolubility in water and the lower oils, high oxygen acid and salt resistance and incompatibility and lack of reactivity with most organic plastics and rubbers with which the product of my invention may come into contact.

In spite of all these advantages the product of the new invention is extremely simple to make and extremely simple to handle and may be made on cheap or readily available machinery, or almost entirely without machinery.

The invention proposes several modified forms of thermal insulating materials and containers to be used in the above described and many other applications.

In one form of the invention an insulated box is disclosed. Another one utilizes an insulating bag of extremely light weight. Each of these embodiments in itself has numerous modifications many of which will be readily apparent to those skilled in the art after reading this speciflcation.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In accordance with the instant invention, insulating structures are made of fibrous material which has been impregnated with silicone resins or of straight silicone resin films. The basic elements of these resins are silicone and oxygen. The silicone atoms also carry one or more hydrocarbon groups joined to the silicon through carbon. The finished resins are obtained by condensation hydroxy organo-silanes or silanols building high polymeric units in the presence of moisture.

In the preparation of the basic materials of my invention, I prefer to prepare paper for cardboard coverings or cardboard itself preconditioning it at relative humidities above percent. Then I expose the materials for from half a minute to 10 minutes to the spray, vapor or liquid solution of hydroxy chloro-organo-silanes in monomeric or low polymeric form causing formation of the high polymer inside the impregnated paper or cardboard or paper board. Polyhydroxy organo silanes or what are popularly called silicones are thus created.

In the accompanying drawing forming a mate rial part of this disclosure:

Fig. 1 is a perspective view of a container made from insulating material in accordance with this invention.

Fig. 2 is an enlarged vertical sectional view taken on line 22 of Fig. 1.

Fig. 3 is an enlarged horizontal sectional view through line 33 of Fig. 2.

Fig. 4 is a fragmentary enlarged top view in perspective showing the top in its opened position.

Fig. 5 is a bottom plan view of the embodiment shown in the preceding figures.

Fig. 6 is a perspective view of another embodiment of this invention in its closed form in use.

Fig. '1 is a bottom plan view of the embodiment shown in the preceding figure.

Fig. 8 is a vertical sectional view through line 8-8 of Fig. 7.

Fig. 9 is a vertical sectional view through line 99 of Fig. 8.

Fig. 10 is an enlarged sectional view of the present invention when used as an insulating sheet.

In accordance with the invention and as has been indicated above, an insulating structure is created from cardboard which has been treated with hydroxy chloro organo-silanes or covered with paper which has undergone this treatment. Wherever reference is made to silane treatments it should be understood that treatment with styrene to effect polystyrene formation in the fibrous product may be used, should silanes be unavailable, giving some but not all the advantages of the silane treated product.

The container will normally have an inside wall In treated as above described, an outside wall I I treated in the same manner and an intermittent space l2 for air and/or heat or cold packing materials such as ice, Dry Ice (frozen carbon dioxide) a vacuum and the like.

The inside container such as horizontal bars 23 and will have a wide inside space l3 which should hold the contents which are intended to be protected from adverse climatic conditions. These contents are normally inserted through a top opening l4 including a hinged or otherwise removable cover IS on a narrow neck base l9 including the topside terminus and filling means I! for the intermittent space where filling of this space is desired. This filling means includes a stopper I8 permitting tight,

closing of the top side section. Drain holes I! which may be very small and which have to be omitted where loss of the filling material may result are provided for draining and ventilation.

The top cover l will usually be hinged as shown in Fig. 4 on hinges 20 and will have one or more protruding lips 2i permitting tight closures of the cover i5.

Where a flexible container is desired, two bags treated as above described, namely an inner bag 30 and an outer bag 3i having an intermittent void 32 for insulation material, may be used. The inside bag will have a wide inside space 33 providing a convenient storage space and a narrow top section 34 providing inserting space for the inside and the intermittent void. This top section provides a narrow neck base 36 providing a platform for sealing strip 43 for the intermittent void upon which rests sealing member 31 tight- 1y enclosing the contents of the container. Ventilator holes 39 may be provided where the insulating medium so permits. These ventilating holes should be very small and may be omitted as indicated above.

It is to be understood that no high weight of silicone impregnation is necessary to provide an effective insulating container according to this invention. Indeed, impregnations providing only between V2 and 15 percent of silicone treatment have given excellent thermal insulation consistent with high flexibility and moisture resistance. As to the kraft, sulphide or bond paper base used, it may be very porous and the drain holes may indeed be omitted where the porosity of the paper itself provided ventilation and breathing of the container.

The operation of the device is believed to be easily understood from the above description. The intermediate space will simply be sealed after the desired insulating medium has been provided. The inside storage space will then be used to store the sensitive material. Extremely good storage and high protection against temperature and humidity will be provided.

It is to be understood that the invention heremay rest upon support described is applicable to simply as an in sulating sheet, that is, a silicone impregnated kraft, sulphide or bond paper 8| and/or a silicone film, which has an adhesive 5| deposited upon one side and a superposed liner 5! coated on said adhesive side for use as an insulating material in refrigerators, ships, buildings, railroad cars, etc., as illustrated in Fig. 10.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claim.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

In a thermal insulated container having walls of waterproof paper material, said walls being spaced forming an inner chamber and voids between the adjacent faces of said walls, said walls being continued at their tops into concentric spaced narrow neck portions terminating substantially in a common plane and forming two openings for the insertion of materials to be stored in the inner chamber and for the insertion of insulating material to 1111 said voids, stopper means closing the opening between the adjacent faces of said neck portions, a separate cover engaged over said neck portions closing the opening leading to said inner chamber and for holding said stopper means in position, and escape means for said voids for waste which accumulates insaid voids.

HAROLD S. COOK, Jl.

REFERENCES CITED The following referenices are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 914,238 Bruner Mar. 2, 1909 1,142,131 Wheelock June 8, 1915 1,265,162 Ayerst May 7, 1918 1,361,370 DeBaun et al. Dec. 7, 1920 1,699,843 Herting Jan. 22, 1929 1,856,986 Drew May 3, 1932 1,883,450 Andrews Oct. 18, 1932 2,099,055 Ferngren Nov. 16, 1937 2,103,318 Clapp Dec. 28, 1937 2,165,327 Zalkind July 11, 1939 2,258,218 Rochow Oct. 7, 1941 2,307,854 Palmer Jan. 12, 1948 

